EP1512876A1 - Countersunk screw - Google Patents

Countersunk screw Download PDF

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Publication number
EP1512876A1
EP1512876A1 EP03026165A EP03026165A EP1512876A1 EP 1512876 A1 EP1512876 A1 EP 1512876A1 EP 03026165 A EP03026165 A EP 03026165A EP 03026165 A EP03026165 A EP 03026165A EP 1512876 A1 EP1512876 A1 EP 1512876A1
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EP
European Patent Office
Prior art keywords
countersunk
countersunk screw
screw according
angle
rib
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP03026165A
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German (de)
French (fr)
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EP1512876B1 (en
Inventor
Robert Dipl.-Ing. Dicke
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AZ Ausruestung und Zubehoer GmbH and Co KG
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AZ Ausruestung und Zubehoer GmbH and Co KG
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Priority to SI200330114T priority Critical patent/SI1512876T1/en
Publication of EP1512876A1 publication Critical patent/EP1512876A1/en
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Publication of EP1512876B1 publication Critical patent/EP1512876B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
    • F16B35/04—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
    • F16B35/06—Specially-shaped heads
    • F16B35/065—Specially-shaped heads with self-countersink-cutting means

Definitions

  • the present invention relates to a countersunk screw with a threaded shaft and a countersunk head, one in the direction of the threaded shaft with a Countersink angle tapered conical surface, wherein the conical surface more over the Circumference distributed, together a conical envelope with a Having cone angle defining rib projections, wherein the countersink angle of the Cone area is smaller than the cone angle of the rib projections.
  • Countersunk screws are known in numerous designs.
  • the countersunk can as Flat or Lensensenkkopf be formed.
  • Such screws are on the one hand for fastening fittings or similar components, in particular made of metal used, wherein the respective component for each screw a countersunk mounting hole has, whose lowering angle is generally about 90 ° in the rule or according to standards.
  • such countersunk screws are also in large quantities for so-called wood-wood joints used by directly screwed without pre-drilling become.
  • the countersunk automatically into the respective material push in and sink. In the latter case, however, due to the Senkwinkels of 90 ° in wood-wood joints splicing of the wood on.
  • the present invention is based on the object, a countersunk screw of to create this type, which - practically as a "universal screw” - for both described applications with good performance characteristics is suitable.
  • the conical surface at least three distributed over the circumference arranged, d. H. circumferentially spaced, rib-like Rib projections with outer, together a conical envelope surface with a Cone angle defining and inventively relatively large dimensioned Investment surfaces on.
  • the area ratio of Sum of the contact surfaces of all rib approaches to the sum of each intervening areas of the conical surface is designed such that on the one hand the ribs approaches not a direct sinking of the countersunk head in wood or hinder the like soft material, and that on the other hand in attaching Components with countersunk holes between the rib projections and the respective Senkloch a specific, material-specific or depending on the Material combination screw component (especially metal-metal) designed in this way Surface pressure is achieved, that surface damage in the range of Senkloches of the component are avoided. It can when donning the Screw a high holding force without risk of damage over the contact surfaces in the respective component are introduced.
  • the ribs are like that designed that in the former application with direct, sinking Screw into a relatively soft material, such as wood or a particular similar soft material, a milling effect (scraping effect) have. This contributes to one good sinking of the head with minimal risk of splicing and low Insertion torque at. Because of the inventive design of the contact surfaces the rib projections does not occur this milling effect when fitting fittings or only insignificant.
  • the countersink angle of the conical surface is smaller than the cone angle of the envelope surface of the Ribbed protrusions.
  • the countersink angle is relatively small or steeply formed; it is approximately in the range of 50 ° to 60 ° and is in particular about 53 ° to 55 °.
  • This countersink angle is particularly advantageous for a direct Screw in wood with reduced risk of splicing when sinking.
  • the cone angle of the rib projections about 90 °, which is advantageous for Fixing of fittings and the like with countersunk Fixing holes is that have a countersink angle of about 90 °.
  • An inventive countersunk screw 1 has a threaded shaft 2 with a Countersunk 4 on.
  • the threaded shaft 2 is in a not shown Screw tip over.
  • the countersunk head 4 points in the direction of the threaded shaft 2 with a certain countersink angle ⁇ tapered conical surface 6 on.
  • the countersunk head 4 is at a flat countersunk head, the on its threaded shaft 2 opposite side has a flat surface 8.
  • the countersunk head 4 but also as so-called Linsensenkopf be designed with a convex curved surface.
  • the countersunk head 4 preferably indicated in Fig. 1 by dashed lines Have internal force attack 10, in particular in the form of a cross slot or a mecanicstemangriffs, preferably with keyway.
  • the threaded shaft 2 consists of an at least partially cylindrical core 12 and a helical over the core 12 as a survey, a or multi-thread 14.
  • the thread 14 defined with its outer Thread edge has a nominal thread diameter D.
  • the thread pitch is shown in FIG. 1 marked with S.
  • At least three fin projections 16 are on the conical surface 6 over distributed around the circumference and arranged spaced from each other.
  • These Rib projections 16 have outer abutment surfaces 18, which together form a conical Define envelope surface with a cone angle ⁇ (Fig. 1).
  • the contact surface 18 each Konusansatzes 16 thus forms part of a conical surface with the cone angle ⁇ .
  • the countersink angle ⁇ of the conical surface. 6 is smaller than the cone angle ⁇ of the envelope surface of the rib projections 16.
  • the countersink angle ⁇ relatively steep is and is in the range of 50 ° to 60 °.
  • the countersunk head 4 For direct screwing in wood with Countersinking the countersunk head 4 without or at least with reduced risk of splicing is a Value of the lowering angle ⁇ of 53 ° to 55 ° particularly advantageous.
  • the cone angle ⁇ is 90 ° and thus corresponds to the usual or standardized countersink angle of countersunk Befest Trentslöchem of fittings or the like components.
  • the total area (sum) of all contact surfaces 18 of the Rib projections 16 should not be too large, so that when sinking in the soft material Allow ribs 16 to sink well.
  • the invention Rippenan arrangements 16 designed so that in this application, the screw with Direct, countersunk screwing, especially in wood or similar Soft materials have a milling effect (scraping effect). This significantly lowers the Of splicing.
  • the rib projections 16 with respect to Area size of the contact surfaces 18 as a function of a material-specific Surface pressure designed so large that in the application for attaching Fittings or the like by screwing in a countersunk hole between the Rippenan accountsn 16 and the respective sink hole such a dimensioned Surface pressure occurs that damage in the area of the countersunk hole be avoided.
  • the minimum size of Bearing surfaces 18 of the rib projections 16 of about 40% of the total area is shown in FIG. 2 shown.
  • the circumferential angular extent of the rib projections 16 with W1 characterized, while the angular extent of the intermediate areas designated W2.
  • the angle W1 be about 24 ° and the angle W2 about 36 °.
  • W1 corresponds to about 40% of the total angle of 60 °.
  • the total size of all contact surfaces 18 but about 50% of total envelope. This means that then the sum of the contact surface 18 all rib projections 16 is approximately equal to the sum of the between the rib approaches 16 lying surfaces is.
  • the screw 1 is for most applications, including the attachment of Metal fittings (steel, aluminum or other non-ferrous metals), all-purpose a standard for screws steel.
  • the countersunk head 4 has, starting from the conical surface 6 on its threaded shaft 2 opposite side a projecting peripheral edge 19 with an outer Circumference 20, which is larger in diameter compared to the conical surface 6 (Fig. 1). This is on the bottom between the peripheral edge 19 and the conical surface 6 a transition 21 is formed.
  • This transition 21 will be practically in the field of Rib projections "filled", so that the rib projections 16 with the contact surfaces 18 as shown in FIG. 1 from the outer periphery 20 corresponding to the angle ⁇ up to the conical surface 6 extend.
  • FIG. 1 According to FIG.
  • the rib projections 16 extend starting from the outer periphery 20 of the countersunk head 4 substantially in the radial direction at least up to the region of an axial projection of the outer thread edge of the Thread 14 of the threaded shaft 2.
  • the rib projections end 16 approximately at a determined by the axial thread projection and thus corresponding to the nominal thread diameter D circular line 22 (Fig. 2 and 4), they but could also still further inward in the direction of the cylindrical Kems 12, d. H. extend into the threaded envelope area.
  • each ribbed projection 16 with similar design and in uniform, radially symmetrical circumferential distribution intended.
  • the number of rib projections 16 can also be in the range from three to eight, for example.
  • the flanks extend 24, 26 but so slightly "overradial", d. H. more from inside to outside diverging more strongly than exactly radial flanks, that each rib neck 16 in the Compared to a design with exactly radial flanks (as in FIG.
  • flanks 24, 26 delimiting the respective rib extension 16 in the circumferential direction with the surface (conical surface 6) adjoining each foot of the rib extension 16 close a flank angle ⁇ greater than or equal to 90 °.
  • the flank 24 pointing forwards in a screwing-in direction has a steeper flank angle ⁇ 1 , which lies between 90 ° and a maximum of 95 °
  • the other flank 26 preferably has a flatter flank angle ⁇ 2 of FIG greater than or equal to 95 °. Due to the steeper flank angle ⁇ 1 , the front flank 24 advantageously forms a type of milling edge, which improves the milling effect during countersinking.
  • the flatter flank angle ⁇ 2 of the other flank 26 makes it easier to unscrew the countersunk screw 1.
  • the thread 14 1, a flank angle ⁇ in the range of about 35 °.
  • the slope S of Thread 14 depends on the thread nominal diameter D and is in particular about 60% of the nominal diameter D.
  • the invention is not limited to the illustrated and described embodiments limited, but also includes all the same in the context of the invention Versions. Furthermore, the invention is not yet in the claim 1 defined feature combination limited, but can also by any arbitrary other combination of certain features of all disclosed Be defined individual characteristics. This means that basically virtually every Individual feature of claim 1 omitted or by at least one at another Site of the application disclosed individual feature can be replaced. insofar claim 1 is merely as a first formulation attempt for an invention to understand.

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Abstract

The countersunk head screw (1) has a cone face (6) with rib projections (16) distributed over the circumference, defining a cone face. The rib projections have external locating faces (18) defining the cone face and which with regard to their surface area are designed in dependence upon a material-specific surface pressure to such degree that with the use of the screw for fastening of fittings and suchlike by screwing into a countersunk hole a defined surface pressure results between the rib projections and countersunk hole, eliminating surface damage. When using the screw with direct screwing into a soft material such as wood the screw has a cutting action.

Description

Die vorliegende Erfindung betrifft eine Senkkopfschraube mit einem Gewindeschaft und einem Senkkopf, der eine in Richtung auf den Gewindeschaft mit einem Senkwinkel zulaufende Kegelfläche aufweist, wobei die Kegelfläche mehrere über den Umfang verteilt angeordnete, gemeinsam eine kegelförmige Hüllfläche mit einem Konuswinkel definierende Rippenansätze aufweist, wobei der Senkwinkel der Kegelfläche kleiner als der Konuswinkel der Rippenansätze ist.The present invention relates to a countersunk screw with a threaded shaft and a countersunk head, one in the direction of the threaded shaft with a Countersink angle tapered conical surface, wherein the conical surface more over the Circumference distributed, together a conical envelope with a Having cone angle defining rib projections, wherein the countersink angle of the Cone area is smaller than the cone angle of the rib projections.

Senkkopfschrauben sind in zahlreichen Ausführungen bekannt. Der Senkkopf kann als Flach- oder Linsensenkkopf ausgebildet sein. Solche Schrauben werden einerseits zum Befestigen von Beschlägen oder dergleichen Bauteilen insbesondere aus Metall verwendet, wobei das jeweilige Bauteil für jede Schraube ein angesenktes Befestigungsloch aufweist, dessen Senkwinkel in der Regel bzw. normgemäß etwa 90° beträgt. Andererseits werden solche Senkkopfschrauben auch in großen Stückzahlen für sogenannte Holz-Holzverbindungen eingesetzt, indem sie ohne Vorbohren direkt eingeschraubt werden. Dabei soll sich der Senkkopf selbsttätig in das jeweilige Material eindrücken und versenken. Bei dem letzteren Anwendungsfall tritt aber aufgrund des Senkwinkels von 90° bei Holz-Holzverbindungen ein Spleißen des Holzes auf. Dies wird durch Schrauben mit einem entsprechend geringeren (steileren) Senkwinkel vermieden; diese Schrauben sind jedoch nicht zum Befestigen von Bauteilen mit 90°-Senklöchem geeignet, weil sie nicht mit einer hinreichend großen Fläche in dem Senkloch zu Anlage kommen, was auch für die Befestigung des Bauteils Nachteile hat.Countersunk screws are known in numerous designs. The countersunk can as Flat or Lensensenkkopf be formed. Such screws are on the one hand for fastening fittings or similar components, in particular made of metal used, wherein the respective component for each screw a countersunk mounting hole has, whose lowering angle is generally about 90 ° in the rule or according to standards. On the other hand, such countersunk screws are also in large quantities for so-called wood-wood joints used by directly screwed without pre-drilling become. Here, the countersunk automatically into the respective material push in and sink. In the latter case, however, due to the Senkwinkels of 90 ° in wood-wood joints splicing of the wood on. This is avoided by screws with a correspondingly lower (steeper) countersink angle; however, these screws are not suitable for mounting components with 90 ° stem holes suitable because they do not have a sufficiently large area in the Senkloch come to plant, which also has disadvantages for the attachment of the component.

Eine solche Senkkopfschraube der zuletzt beschriebenen, gattungsgemäßen Art ist in der EP 0 781 382 B1 beschrieben. Die auf der mit relativ steilem Senkwinkel ausgebildeten Kegelfläche vorgesehenen, sehr schmalen Rippen weisen Senkschneiden auf, so dass die Schraube in der Lage ist, mittels der Rippen in einem Werkstück eine Senkung für den Senkkopf freizuschneiden. Diese Schraube eignet sich deshalb nicht zum Befestigen von Beschlägen oder dergleichen mit 90°-Senklöchem, weil dabei die Rippen mit ihren Senkschneiden Oberflächenbeschädigungen verursachen und sich mit ihren sehr schmalen Flächen eindrücken würden. Such a countersunk screw of the last-described, generic type is in EP 0 781 382 B1. The trained on the relatively steep sinking angle Conical surface provided, very narrow ribs have sinkers on, so that the screw is able by means of the ribs in a workpiece a Cut down countersink for the countersunk head. This screw is therefore not suitable for attaching fittings or the like with 90 ° -Senklöchem, because while doing the Ribs with their sinkers cause surface damage and damage with their very narrow surfaces would impress.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Senkkopfschraube der genannten Art zu schaffen, die - praktisch als "Universalschraube" - für beide beschriebenen Anwendungsfälle mit guten Gebrauchseigenschaften geeignet ist.The present invention is based on the object, a countersunk screw of to create this type, which - practically as a "universal screw" - for both described applications with good performance characteristics is suitable.

Erfindungsgemäß wird dies durch die Merkmale des Anspruchs 1 erreicht. Weitere vorteilhafte Ausgestaltungsmerkmale der Erfindung sind in den Unteransprüchen enthalten.This is achieved by the features of claim 1 according to the invention. Further advantageous design features of the invention are in the subclaims contain.

Demnach weist die Kegelfläche mindestens drei über den Umfang verteilt angeordnete, d. h. in Umfangsrichtung voneinander beabstandete, rippenartige Rippenansätze mit äußeren, gemeinsam eine kegelförmige Hüllfläche mit einem Konuswinkel definierenden und erfindungsgemäß relativ groß dimensonierten Anlageflächen auf. Dies bedeutet, dass erfindungsgemäß das Flächenverhältnis der Summe der Anlageflächen aller Rippenansätze zu der Summe der jeweils dazwischen liegenden Bereiche der Kegelfläche derart ausgelegt ist, dass einerseits die Rippenansätze nicht ein direktes Einsenken des Senkkopfes in Holz oder dergleichen Weichstoff behindern, und dass andererseits beim Befestigen von Bauteilen mit Senklöchern zwischen den Rippenansätzen und dem jeweiligen Senkloch eine bestimmte, werkstoff-spezifisch bzw. in Abhängigkeit von der Werkstoffkombination Schraube-Bauteil (insbesondere Metall-Metall) so ausgelegte Flächenpressung erreicht wird, dass Oberflächenbeschädigungen im Bereich des Senkloches des Bauteils vermieden werden. Dabei kann beim Anziehen der Schraube eine hohe Haltekraft ohne Beschädigungsgefahr über die Anlageflächen in das jeweilige Bauteil eingeleitet werden. Gleichzeitig sind die Rippenansätze derart gestaltet, dass sie bei der erstgenannten Anwendung mit direktem, versenkendem Einschrauben in ein relativ weiches Material, wie insbesondere Holz oder einen ähnlichen Weichstoff, eine Fräswirkung (Schabeffekt) haben. Dies trägt zu einem guten Versenken des Kopfes mit minimaler Spleißgefahr und geringem Eindrehmoment bei. Wegen der erfindungsgemäßen Auslegung der Anlageflächen der Rippenansätze tritt diese Fräswirkung bei der Beschlagbefestigung nicht oder nur unbedeutend auf.Accordingly, the conical surface at least three distributed over the circumference arranged, d. H. circumferentially spaced, rib-like Rib projections with outer, together a conical envelope surface with a Cone angle defining and inventively relatively large dimensioned Investment surfaces on. This means that according to the invention the area ratio of Sum of the contact surfaces of all rib approaches to the sum of each intervening areas of the conical surface is designed such that on the one hand the ribs approaches not a direct sinking of the countersunk head in wood or hinder the like soft material, and that on the other hand in attaching Components with countersunk holes between the rib projections and the respective Senkloch a specific, material-specific or depending on the Material combination screw component (especially metal-metal) designed in this way Surface pressure is achieved, that surface damage in the range of Senkloches of the component are avoided. It can when donning the Screw a high holding force without risk of damage over the contact surfaces in the respective component are introduced. At the same time, the ribs are like that designed that in the former application with direct, sinking Screw into a relatively soft material, such as wood or a particular similar soft material, a milling effect (scraping effect) have. This contributes to one good sinking of the head with minimal risk of splicing and low Insertion torque at. Because of the inventive design of the contact surfaces the rib projections does not occur this milling effect when fitting fittings or only insignificant.

Der Senkwinkel der Kegelfläche ist kleiner als der Konuswinkel der Hüllfläche der Rippenansätze. In bevorzugter Ausgestaltung ist der Senkwinkel relativ klein bzw. steil ausgebildet; er liegt etwa im Bereich von 50° bis 60° und beträgt insbesondere etwa 53° bis 55°. Dieser Senkwinkel ist besonders vorteilhaft für ein direktes Einschrauben in Holz mit reduzierter Spleißgefahr beim Einsenken. Demgegenüber beträgt der Konuswinkel der Rippenansätze etwa 90°, was von Vorteil zur Befestigung von Beschlägen und dergleichen Bauteilen mit angesenkten Befestigungslöchern ist, die einen Senkwinkel von ebenfalls etwa 90° aufweisen.The countersink angle of the conical surface is smaller than the cone angle of the envelope surface of the Ribbed protrusions. In a preferred embodiment, the countersink angle is relatively small or steeply formed; it is approximately in the range of 50 ° to 60 ° and is in particular about 53 ° to 55 °. This countersink angle is particularly advantageous for a direct Screw in wood with reduced risk of splicing when sinking. In contrast, is the cone angle of the rib projections about 90 °, which is advantageous for Fixing of fittings and the like with countersunk Fixing holes is that have a countersink angle of about 90 °.

Anhand von in der Zeichnung veranschaulichten, bevorzugten Ausführungsbeispielen soll die Erfindung genauer erläutert werden. Dabei zeigen:

Fig. 1
eine Teil-Seitenansicht einer erfindungsgemäßen Senkkopfschraube im Bereich des Senkkopfes und eines Teils des sich anschließenden Gewindeschaftes,
Fig. 2
eine Schnittansicht in Pfeilrichtung II - II gemäß Fig. 1,
Fig. 3
einen Teilschnitt durch den Bereich eines der erfindungsgemäßen Rippenansätze in der Ebene III - III gemäß Fig. 2 und
Fig. 4
eine Darstellung analog zu Fig. 2 in einer Ausführungsvariante.
Reference to illustrated in the drawing, preferred embodiments of the invention will be explained in more detail. Showing:
Fig. 1
a partial side view of a countersunk head screw according to the invention in the region of the countersunk head and a part of the subsequent threaded shaft,
Fig. 2
a sectional view in the direction of arrow II - II of FIG. 1,
Fig. 3
a partial section through the region of the rib projections according to the invention in the plane III - III of FIG. 2 and
Fig. 4
a representation analogous to FIG. 2 in a variant embodiment.

Eine erfindungsgemäße Senkkopfschraube 1 weist einen Gewindeschaft 2 mit einem Senkkopf 4 auf. Anderendig geht der Gewindeschaft 2 in eine nicht dargestellte Schraubenspitze über. Der Senkkopf 4 weist eine in Richtung auf den Gewindeschaft 2 mit einem bestimmten Senkwinkel α zulaufende Kegelfläche 6 auf.An inventive countersunk screw 1 has a threaded shaft 2 with a Countersunk 4 on. Alternatively, the threaded shaft 2 is in a not shown Screw tip over. The countersunk head 4 points in the direction of the threaded shaft 2 with a certain countersink angle α tapered conical surface 6 on.

Bei dem dargestellten Ausführungsbeispiel handelt es sich bei dem Senkkopf 4 um einen Flachsenkkopf, der auf seiner dem Gewindeschaft 2 entgegengesetzten Seite eine ebene Fläche 8 aufweist. Alternativ kann der Senkkopf 4 aber auch als sogenannter Linsensenkopf mit einer konvex gekrümmten Fläche ausgeführt sein. In beiden Fällen kann der Senkkopf 4 bevorzugt einen in Fig. 1 gestrichelt angedeuteten Innenkraftangriff 10 aufweisen, und zwar insbesondere in Form eines Kreuzschlitzes oder eines Innenstemangriffs, vorzugsweise mit Schlüsselführung.In the illustrated embodiment, the countersunk head 4 is at a flat countersunk head, the on its threaded shaft 2 opposite side has a flat surface 8. Alternatively, the countersunk head 4 but also as so-called Linsensenkopf be designed with a convex curved surface. In In both cases, the countersunk head 4 preferably indicated in Fig. 1 by dashed lines Have internal force attack 10, in particular in the form of a cross slot or a Innenstemangriffs, preferably with keyway.

Der Gewindeschaft 2 besteht aus einem zumindest abschnittsweise zylindrischen Kern 12 und einem als Erhebung schraubenlinienförmig über den Kern 12 verlaufenden, ein- oder mehrgängigen Gewinde 14. Das Gewinde 14 definiert mit seiner äußeren Gewindekante einen Gewinde-Nenndurchmesser D. Die Gewindesteigung ist in Fig. 1 mit S eingezeichnet.The threaded shaft 2 consists of an at least partially cylindrical core 12 and a helical over the core 12 as a survey, a or multi-thread 14. The thread 14 defined with its outer Thread edge has a nominal thread diameter D. The thread pitch is shown in FIG. 1 marked with S.

Erfindungsgemäß sind auf der Kegelfläche 6 mindestens drei Rippenansätze 16 über den Umfang verteilt und jeweils voneinander beabstandet angeordnet. Diese Rippenansätze 16 weisen äußere Anlageflächen 18 auf, die gemeinsam eine konische Hüllfläche mit einem Konuswinkel β definieren (Fig. 1). Die Anlagefläche 18 jedes Konusansatzes 16 bildet somit einen Teil einer Konusfläche mit dem Konuswinkel β. Dabei ist erfindungsgemäß vorgesehen, dass der Senkwinkel α der Kegelfläche 6 kleiner als der Konuswinkel β der Hüllfläche der Rippenansätze 16 ist. Für eine universelle bzw. wahlweise Anwendung der Senkkopfschraube 1 in den oben beschriebenen Anwendungsfällen ist es vorteilhaft, wenn der Senkwinkel α relativ steil ist und etwa im Bereich von 50° bis 60° liegt. Für ein direktes Einschrauben in Holz mit Einsenken des Senkkopfes 4 ohne oder zumindest mit reduzierter Spleißgefahr ist ein Wert des Senkwinkels α von 53° bis 55° besonders vorteilhaft. Der Konuswinkel β beträgt 90° und entspricht damit dem üblichen bzw. genormten Senkwinkel von angesenkten Befestigungslöchem von Beschlägen oder dergleichen Bauteilen.According to the invention, at least three fin projections 16 are on the conical surface 6 over distributed around the circumference and arranged spaced from each other. These Rib projections 16 have outer abutment surfaces 18, which together form a conical Define envelope surface with a cone angle β (Fig. 1). The contact surface 18 each Konusansatzes 16 thus forms part of a conical surface with the cone angle β. It is inventively provided that the countersink angle α of the conical surface. 6 is smaller than the cone angle β of the envelope surface of the rib projections 16. For one universal or optional application of the countersunk screw 1 in the above described applications, it is advantageous if the countersink angle α relatively steep is and is in the range of 50 ° to 60 °. For direct screwing in wood with Countersinking the countersunk head 4 without or at least with reduced risk of splicing is a Value of the lowering angle α of 53 ° to 55 ° particularly advantageous. The cone angle β is 90 ° and thus corresponds to the usual or standardized countersink angle of countersunk Befestigungslöchem of fittings or the like components.

Dazu sollte einerseits die Gesamtfläche (Summe) aller Anlageflächen 18 der Rippenansätze 16 nicht zu groß sein, damit sich beim Einsenken im Weichstoff die Rippenansätze 16 gut miteinsenken lassen. Dabei sind erfindungsgemäß die Rippenansätze 16 so gestaltet, dass sie bei dieser Anwendung der Schraube mit direktem, versenkendem Einschrauben insbesondere in Holz oder ähnliche Weichstoffe eine Fräswirkung (Schabeffekt) haben. Dies senkt deutlich die Spleißgefahr. Andererseits sind aber die Rippenansätze 16 bezüglich der Flächengröße der Anlageflächen 18 in Abhängigkeit von einer werkstoff-spezifischen Flächenpressung derart groß ausgelegt, dass bei der Anwendung zum Befestigen von Beschlägen oder dergleichen durch Einschrauben in ein Senkloch zwischen den Rippenansätzen 16 und dem jeweiligen Senkloch eine derart bemessene Flächenpressung auftritt, dass Beschädigungen im Bereich des Senkloches vermieden werden. Dazu sollte die Summe der Anlageflächen 18 aller Rippenansätze 16 im Bereich von mindestens 40 % bis maximal etwa 60 % der auf den ganzen Umfang bezogenen kegelförmigen Hüllfläche liegen. Die minimale Größe der Anlageflächen 18 der Rippenansätze 16 von etwa 40 % der Gesamtfläche ist in Fig. 2 dargestellt. Dazu ist die umfängliche Winkelerstreckung der Rippenansätze 16 mit W1 gekennzeichnet, während die Winkelerstreckung der dazwischen liegenden Bereiche mit W2 bezeichnet ist. Im dargestellten Beispiel betragen der Winkel W1 etwa 24° und der Winkel W2 etwa 36°. Somit entspricht W1 etwa 40 % des Gesamtwinkels von 60°. Vorzugsweise sollte die Gesamtgröße aller Anlageflächen 18 aber etwa 50 % der gesamten Hüllfläche betragen. Dies bedeutet, dass dann die Summe der Anlagefläche 18 aller Rippenansätze 16 etwa gleich der Summe der zwischen den Rippenansätzen 16 liegenden Flächen ist.On the one hand, the total area (sum) of all contact surfaces 18 of the Rib projections 16 should not be too large, so that when sinking in the soft material Allow ribs 16 to sink well. In this case, the invention Rippenansätze 16 designed so that in this application, the screw with Direct, countersunk screwing, especially in wood or similar Soft materials have a milling effect (scraping effect). This significantly lowers the Of splicing. On the other hand, however, the rib projections 16 with respect to Area size of the contact surfaces 18 as a function of a material-specific Surface pressure designed so large that in the application for attaching Fittings or the like by screwing in a countersunk hole between the Rippenansätzen 16 and the respective sink hole such a dimensioned Surface pressure occurs that damage in the area of the countersunk hole be avoided. This should be the sum of the contact surfaces 18 all rib approaches 16 in the range of at least 40% to a maximum of about 60% of the total Scope related conical envelope surface lie. The minimum size of Bearing surfaces 18 of the rib projections 16 of about 40% of the total area is shown in FIG. 2 shown. For this purpose, the circumferential angular extent of the rib projections 16 with W1 characterized, while the angular extent of the intermediate areas designated W2. In the example shown, the angle W1 be about 24 ° and the angle W2 about 36 °. Thus, W1 corresponds to about 40% of the total angle of 60 °. Preferably, the total size of all contact surfaces 18 but about 50% of total envelope. This means that then the sum of the contact surface 18 all rib projections 16 is approximately equal to the sum of the between the rib approaches 16 lying surfaces is.

Die Schraube 1 besteht für die meisten Anwendungen, so auch zur Befestigung von Beschlägen aus Metall (Stahl, Aluminium oder sonstige Buntmetalle), universell aus einem für Schrauben üblichen Stahl.The screw 1 is for most applications, including the attachment of Metal fittings (steel, aluminum or other non-ferrous metals), all-purpose a standard for screws steel.

Der Senkkopf 4 weist ausgehend von der Kegelfläche 6 auf seiner dem Gewindeschaft 2 gegenüberliegenden Seite einen überstehenden Umfangsrand 19 mit einem äußeren Umfang 20 auf, der im Vergleich zu der Kegelfläche 6 im Durchmesser größer ist (Fig. 1). Dadurch ist auf der Unterseite zwischen dem Umfangsrand 19 und der Kegelfläche 6 ein Übergang 21 gebildet. Dieser Übergang 21 wird praktisch im Bereich der Rippenansätze "ausgefüllt", so dass sich die Rippenansätze 16 mit den Anlageflächen 18 gemäß Fig. 1 vom Außenumfang 20 entsprechend dem Winkel β bis zu der Kegelfläche 6 erstrecken. Gemäß Fig. 2 erstrecken sich die Rippenansätze 16 ausgehend von dem äußeren Umfang 20 des Senkkopfes 4 im Wesentlichen in radialer Richtung zumindest bis an den Bereich einer axialen Projektion der äußeren Gewindekante des Gewindes 14 des Gewindeschaftes 2. Beim dargestellten Beispiel enden die Rippenansätze 16 etwa an einer durch die axiale Gewindeprojektion bestimmten und damit dem Gewinde-Nenndurchmesser D entsprechenden Kreislinie 22 (Fig. 2 und 4), sie könnten aber auch noch weiter nach innen in Richtung des zylindrischen Kems 12, d. h. in den Gewinde-Hüllbereich hinein verlaufen.The countersunk head 4 has, starting from the conical surface 6 on its threaded shaft 2 opposite side a projecting peripheral edge 19 with an outer Circumference 20, which is larger in diameter compared to the conical surface 6 (Fig. 1). This is on the bottom between the peripheral edge 19 and the conical surface 6 a transition 21 is formed. This transition 21 will be practically in the field of Rib projections "filled", so that the rib projections 16 with the contact surfaces 18 as shown in FIG. 1 from the outer periphery 20 corresponding to the angle β up to the conical surface 6 extend. According to FIG. 2, the rib projections 16 extend starting from the outer periphery 20 of the countersunk head 4 substantially in the radial direction at least up to the region of an axial projection of the outer thread edge of the Thread 14 of the threaded shaft 2. In the example shown, the rib projections end 16 approximately at a determined by the axial thread projection and thus corresponding to the nominal thread diameter D circular line 22 (Fig. 2 and 4), they but could also still further inward in the direction of the cylindrical Kems 12, d. H. extend into the threaded envelope area.

Weiterhin sind bei den dargestellten Ausführungsbeispielen sechs Rippenansätze 16 mit gleichartiger Ausgestaltung und in gleichmässiger, radialsymmetrischer Umfangsverteilung vorgesehen. Die Anzahl der Rippenansätze 16 kann aber auch im Bereich von drei bis beispielsweise acht liegen. Dabei ist jeder Rippenansatz 16 gemäß Fig. 2 und 4 bezüglich der Form seiner Anlagefläche 18 im Wesentlichen als Kreisringausschnitt (Sektor) mit etwa radial verlaufenden Flanken 24, 26 ausgebildet (vergleiche auch Fig. 3). Bei dem in Fig. 4 dargestellten Ausführungsbeispiel verlaufen die Flanken 24, 26 allerdings derart geringfügig "überradial", d. h. von innen nach außen mehr bzw. stärker als bei genau radialen Flanken divergierend, dass jeder Rippenansatz 16 im Vergleich zu einer Ausführung mit genau radial verlaufenden Flanken (wie in Fig. 2 dargestellt und in Fig. 4 anhand von Strichpunktlinien 28 angedeutet) am Innenumfang schmaler (bzw. am Außenumfang breiter) ausgebildet ist. Dadurch liegt im Unterschied zu Fig. 2 gemäß Fig. 4 ein Schnittpunkt 30 von zwei durch die Flanken 24, 26 bestimmten Begrenzungslinien 32 (gestrichelt eingezeichnet) nicht im Achsmittelpunkt X der Schraube (wie dies in Fig. 2 der Fall ist), sondern radial zwischen diesem und dem jeweiligen Rippenansatz 16.Furthermore, in the illustrated embodiments, six rib projections 16 with similar design and in uniform, radially symmetrical circumferential distribution intended. The number of rib projections 16 can also be in the range from three to eight, for example. In this case, each ribbed projection 16 according to FIG. 2 and 4 with respect to the shape of its contact surface 18 substantially as a circular ring cutout (Sector) formed with approximately radially extending flanks 24, 26 (see also Fig. 3). In the embodiment shown in FIG. 4, the flanks extend 24, 26 but so slightly "overradial", d. H. more from inside to outside diverging more strongly than exactly radial flanks, that each rib neck 16 in the Compared to a design with exactly radial flanks (as in FIG. 2 represented and indicated in Fig. 4 by dashed lines 28) on the inner circumference narrower (or wider on the outer circumference) is formed. This is the difference to Fig. 2 of FIG. 4, an intersection point 30 of two by the flanks 24, 26 certain Boundary lines 32 (dashed lines) not in the center of the axis X the screw (as is the case in Fig. 2), but radially between it and the respective rib approach 16.

Wie sich weiter aus Fig. 3 ergibt, schließen die den jeweiligen Rippenansatz 16 in Umfangsrichtung begrenzenden Flanken 24, 26 mit der jeweils am Fuß des Rippenansatzes 16 angrenzenden Fläche (Kegelfläche 6) einen Flankenwinkel ϕ größer/gleich 90° ein. Hierbei ist vorzugsweise vorgesehen, dass die bei Drehung in einer Einschraubrichtung (Pfeil 34) nach vorne weisende Flanke 24 einen steileren Flankenwinkel ϕ1 aufweist, der zwischen 90° und maximal 95° liegt, während die andere Flanke 26 bevorzugt einen flacheren Flankenwinkel ϕ2 von größer/gleich 95° aufweist. Durch den steileren Flankenwinkel ϕ1 bildet die vordere Flanke 24 vorteilhafterweise eine Art Fräskante, die die Fräswirkung beim Einsenken verbessert. Der flachere Flankenwinkel ϕ2 der anderen Flanke 26 ermöglicht ein leichteres Herausdrehen der Senkkopfschraube 1.As is further apparent from FIG. 3, the flanks 24, 26 delimiting the respective rib extension 16 in the circumferential direction with the surface (conical surface 6) adjoining each foot of the rib extension 16 close a flank angle φ greater than or equal to 90 °. In this case, it is preferably provided that the flank 24 pointing forwards in a screwing-in direction (arrow 34) has a steeper flank angle φ 1 , which lies between 90 ° and a maximum of 95 °, while the other flank 26 preferably has a flatter flank angle φ 2 of FIG greater than or equal to 95 °. Due to the steeper flank angle φ 1 , the front flank 24 advantageously forms a type of milling edge, which improves the milling effect during countersinking. The flatter flank angle φ 2 of the other flank 26 makes it easier to unscrew the countersunk screw 1.

In weiterer vorteilhafter Ausgestaltung der Senkkopfschraube 1 weist das Gewinde 14 gemäß Fig. 1 einen Flankenwinkel γ im Bereich um etwa 35° auf. Die Steigung S des Gewindes 14 hängt von dem Gewinde-Nenndurchmesser D ab und beträgt insbesondere etwa 60 % des Nenndurchmessers D.In a further advantageous embodiment of the countersunk screw 1, the thread 14 1, a flank angle γ in the range of about 35 °. The slope S of Thread 14 depends on the thread nominal diameter D and is in particular about 60% of the nominal diameter D.

Die Erfindung ist nicht auf die dargestellten und beschriebenen Ausführungsbeispiele beschränkt, sondern umfaßt auch alle im Sinne der Erfindung gleichwirkenden Ausführungen. Ferner ist die Erfindung bislang auch noch nicht auf die im Anspruch 1 definierte Merkmalskombination beschränkt, sondern kann auch durch jede beliebige andere Kombination von bestimmten Merkmalen aller insgesamt offenbarten Einzelmerkmalen definiert sein. Dies bedeutet, daß grundsätzlich praktisch jedes Einzelmerkmal des Anspruchs 1 weggelassen bzw. durch mindestens ein an anderer Stelle der Anmeldung offenbartes Einzelmerkmal ersetzt werden kann. Insofern ist der Anspruch 1 lediglich als ein erster Formulierungsversuch für eine Erfindung zu verstehen.The invention is not limited to the illustrated and described embodiments limited, but also includes all the same in the context of the invention Versions. Furthermore, the invention is not yet in the claim 1 defined feature combination limited, but can also by any arbitrary other combination of certain features of all disclosed Be defined individual characteristics. This means that basically virtually every Individual feature of claim 1 omitted or by at least one at another Site of the application disclosed individual feature can be replaced. insofar claim 1 is merely as a first formulation attempt for an invention to understand.

Claims (14)

Senkkopfschraube (1) mit einem Gewindeschaft (2) und einem Senkkopf (4), der eine in Richtung auf den Gewindeschaft (2) mit einem Senkwinkel (α) zulaufende Kegelfläche (6) aufweist, wobei die Kegelfläche (6) mehrere über den Umfang verteilt angeordnete, gemeinsam eine kegelförmige Hüllfläche mit einem Konuswinkel (β) definierende Rippenansätze (16) aufweist, wobei der Senkwinkel (α) der Kegelfläche (6) kleiner als der Konuswinkel (β) der Rippenansätze (16) ist,
dadurch gekennzeichnet, dass
die Rippenansätze (16) äußere, die kegelförmige Hüllfläche definierende Anlageflächen (18) aufweisen, die bezüglich ihrer Flächengröße in Abhängigkeit von einer werkstoff-spezifischen Flächenpressung derart groß ausgelegt sind, dass bei einer Anwendung der Schraube zum Befestigen von Beschlägen oder dergleichen durch Einschrauben in ein Senkloch zwischen den Rippenansätzen (16) und dem jeweiligen Senkloch eine bestimmte, Oberflächenbeschädigungen vermeidende Flächenpressung auftritt, wobei die Rippenansätze (16) zusätzlich derart gestaltet sind, dass sie bei einer Anwendung der Schraube mit direktem, versenkendem Einschrauben in einen Weichstoff, wie insbesondere Holz, eine Fräswirkung haben.Countersunk screw (1) with a threaded shank (2) and a countersunk head (4), which has a conical surface (6) tapering towards the threaded shank (2) with a countersinking angle (α), wherein the conical surface (6) has several over the circumference distributed, jointly a conical envelope surface with a cone angle (β) defining rib projections (16), wherein the countersink angle (α) of the conical surface (6) is smaller than the cone angle (β) of the rib projections (16),
characterized in that
the rib projections (16) outer, the conical envelope surface defining abutment surfaces (18) which are designed so large in terms of their area size depending on a material-specific surface pressure, that in an application of the screw for attaching fittings or the like by screwing in a Senkloch between the ribs approaches (16) and the respective countersunk hole a certain surface damage avoiding surface pressure occurs, the ribs approaches (16) are additionally designed such that they in an application of the screw with direct, sunk screwing into a soft material, in particular wood, have a milling action. Senkkopfschraube nach Anspruch 1,
dadurch gekennzeichnet, dass die Summeder Anlageflächen (18) aller Rippenansätze (16) im Bereich von mindestens 40 % bis etwa 60 % der auf den ganzen Umfang bezogenen kegelförmigen Hüllfläche liegt.Countersunk screw according to claim 1,
characterized in that the sum of the abutment surfaces (18) of all rib projections (16) is in the range of at least 40% to about 60% of the conical envelope surface which is related to the entire circumference. Senkkopfschraube nach Anspruch 1 oder 2,
dadurch gekennzeichnet, dass die Summe der Anlageflächen (18) aller Rippenansätze (16) etwa gleich der Summe der zwischen den Rippenansätzen (16) liegenden Flächen ist.Countersunk screw according to claim 1 or 2,
characterized in that the sum of the contact surfaces (18) of all rib projections (16) is approximately equal to the sum of the surfaces between the ribs (16) lying. Senkkopfschraube nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet, dass der Senkwinkel (α) etwa im Bereich von 50° bis 60°, insbesondere von 53° bis 55°, liegt. Countersunk screw according to one of claims 1 to 3,
characterized in that the countersinking angle (α) is approximately in the range of 50 ° to 60 °, in particular of 53 ° to 55 °. Senkkopfschraube nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet, dass der Konuswinkel (β) etwa 90° beträgt.Countersunk screw according to one of claims 1 to 4,
characterized in that the cone angle (β) is about 90 °. Senkkopfschraube nach einem der Ansprüche 1 bis 5,
dadurch gekennzeichnet, dass die Rippenansätze (16) sich ausgehend etwa von einem äußeren Umfang (20) des Senkkopfes (4) im Wesentlichen in radialer Richtung zumindest bis an den Bereich einer axialen Projektion (22) eines Gewindes (14) des Gewindeschaftes (2) erstrecken.Countersunk screw according to one of claims 1 to 5,
characterized in that the rib projections (16) extend approximately from an outer circumference (20) of the countersunk head (4) substantially in the radial direction at least to the region of an axial projection (22) of a thread (14) of the threaded shank (2). extend. Senkkopfschraube nach einem der Ansprüche 1 bis 6,
dadurch gekennzeichnet, dass die Rippenansätze (16) mit gleichartiger Ausgestaltung und mit einer Anzahl von drei bis acht, insbesondere sechs, in gleichmäßiger, radialsymmetrischer Umfangsverteilung vorgesehen sind.Countersunk screw according to one of claims 1 to 6,
characterized in that the rib projections (16) are provided with similar configuration and with a number of three to eight, in particular six, in a uniform, radially symmetrical circumferential distribution. Senkkopfschraube nach einem der Ansprüche 1 bis 7,
dadurch gekennzeichnet, dass jeder Rippenansatz (16) bezüglich seiner Anlagefläche (18) im Wesentlichen als Kreisringausschnitt mit etwa radial verlaufenden Flanken (24, 26) ausgebildet ist.Countersunk screw according to one of claims 1 to 7,
characterized in that each rib projection (16) with respect to its contact surface (18) substantially as a circular ring cutout with approximately radially extending flanks (24, 26) is formed. Senkkopfschraube nach einem der Ansprüche 1 bis 8,
dadurch gekennzeichnet, dass jeder Rippenansatz (16) in Umfangsrichtung von zwei Flanken (24, 26) begrenzt ist, wobei die Flanken (24, 26) mit der jeweils fußseitig angrenzenden Fläche einen Flankenwinkel (ϕ1 ; ϕ2) größer/gleich 90° einschließen.Countersunk screw according to one of claims 1 to 8,
characterized in that each rib projection (16) in the circumferential direction of two flanks (24, 26) is limited, wherein the flanks (24, 26) with the respective foot side adjacent surface a flank angle (φ 1 ; φ 2 ) is greater than / equal to 90 ° lock in. Senkkopfschraube nach Anspruch 9,
dadurch gekennzeichnet, dass die bei Drehung in einer Einschraubrichtung (34) nach vorne weisende Flanke (24) einen Flankenwinkel (ϕ1) aufweist, der zwischen 90° und 95° liegt, während die andere Flanke (26) bevorzugt einen Flankenwinkel (ϕ2) von größer/gleich 95° aufweist. Countersunk screw according to claim 9,
characterized in that during rotation in a screwing-in direction (34) forwardly facing edge (24) a flank angle (φ 1) which is between 90 ° and 95 °, while the other flank preferably (26) a flank angle (φ 2 ) of greater than or equal to 95 °. Senkkopfschraube nach einem der Ansprüche 1 bis 10,
dadurch gekennzeichnet, dass der Gewindeschaft (2) aus einem zumindest bereichsweise zylindrischen Kern (12) und einem als Erhebung über den Kern (12) verlaufenden Gewinde (14) besteht.Countersunk screw according to one of claims 1 to 10,
characterized in that the threaded shaft (2) consists of an at least partially cylindrical core (12) and an elevation over the core (12) extending thread (14). Senkkopfschraube nach Anspruch 11,
dadurch gekennzeichnet, dass das Gewinde (14) einen Flankenwinkel (γ) von etwa 35° aufweist.Countersunk screw according to claim 11,
characterized in that the thread (14) has a flank angle (γ) of about 35 °. Senkkopfschraube nach Anspruch 11 oder 12,
dadurch gekennzeichnet, dass das Gewinde (14) eine Steigung (S) aufweist, die von einem Gewinde-Nenndurchmesser (D) abhängt und insbesondere etwa 60 % des Nenndurchmessers (D) beträgt.Countersunk screw according to claim 11 or 12,
characterized in that the thread (14) has a pitch (S) which depends on a nominal thread diameter (D) and in particular is about 60% of the nominal diameter (D). Senkkopfschraube nach einem der Ansprüche 1 bis 13,
dadurch gekennzeichnet, dass der Senkkopf (4) einen Innenkraftangriff (10) für ein Drehwerkzeug insbesondere in Form eines Kreuzschlitzes oder eines Innenstemangriffs, vorzugsweise mit Schlüsselführung, aufweist.Countersunk screw according to one of claims 1 to 13,
characterized in that the countersunk head (4) has an internal force attack (10) for a rotary tool, in particular in the form of a Phillips or Innenstemangriffs, preferably with a keyway.
EP03026165A 2003-09-05 2003-11-17 Countersunk screw Expired - Lifetime EP1512876B1 (en)

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DE20313819U DE20313819U1 (en) 2003-09-05 2003-09-05 countersunk
DE20313819U 2003-09-05

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CN (1) CN100451358C (en)
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DE50302107D1 (en) 2006-03-30
JP4395167B2 (en) 2010-01-06
SI1512876T1 (en) 2006-04-30
ES2254856T3 (en) 2006-06-16
CA2481011C (en) 2008-05-27
DE20313819U1 (en) 2005-01-13
CN100451358C (en) 2009-01-14
RU2006104560A (en) 2006-06-27
ATE315180T1 (en) 2006-02-15
EP1512876B1 (en) 2006-01-04
CA2481011A1 (en) 2005-03-05
JP2007504418A (en) 2007-03-01
RU2314441C2 (en) 2008-01-10
WO2005028883A1 (en) 2005-03-31
US7334976B2 (en) 2008-02-26
RU2314441C9 (en) 2008-04-20
US20050063796A1 (en) 2005-03-24
CN1846071A (en) 2006-10-11
HK1094242A1 (en) 2007-03-23

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